Standing water at the overhead-door threshold indicates a drainage issue at the loading entrance. Slab slopes back toward the building.
Gate is 15 ft wide and seals well. Recommend a trench drain across the opening and slab reinforcement for heavy forklift traffic.
Trench drain discharges to the right of the entrance; pipe runs under the slab, 20 ft from the parking area. No ice issue observed at the parking-lot drain.